/*
 * Copyright (C) 2017  Christopher J. Howard
 *
 * This file is part of Antkeeper Source Code.
 *
 * Antkeeper Source Code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper Source Code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper Source Code.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef MATERIALS
#define MATERIALS

#include <emergent/emergent.hpp>

using namespace Emergent;

enum class MaterialFormat
{
	UI,
	PHYSICAL
};

class UIMaterial: public Material
{
public:
	UIMaterial(): texture(nullptr) {}
	virtual ~UIMaterial() {}
	
	virtual unsigned int getMaterialFormatID() const;
	
	Texture* texture;
};

inline unsigned int UIMaterial::getMaterialFormatID() const
{
	return static_cast<unsigned int>(MaterialFormat::UI);
}

/// @see https://www.marmoset.co/posts/physically-based-rendering-and-you-can-too/
class PhysicalMaterial: public Material
{
public:
	enum class Flags
	{
		OBJECT  = 0x01,
		TERRAIN = 0x02,
		SOIL    = 0x04,
		TRANSLUCENT = 0x08
	};
	
	PhysicalMaterial():
		albedoOpacityMap(nullptr),
		metalnessRoughnessMap(nullptr),
		normalOcclusionMap(nullptr),
		flags((unsigned int)Flags::OBJECT),
		shadowCaster(true),
		shadowReceiver(true)
	{};
	virtual ~PhysicalMaterial() {};
	virtual unsigned int getMaterialFormatID() const;
	
	unsigned int flags;
	Vector3 albedo;
	float opacity;
	float metalness;
	float roughness;
	Texture* albedoOpacityMap;
	Texture* metalnessRoughnessMap;
	Texture* normalOcclusionMap;
	bool shadowCaster;
	bool shadowReceiver;
};

inline unsigned int PhysicalMaterial::getMaterialFormatID() const
{
	return static_cast<unsigned int>(MaterialFormat::PHYSICAL);
}

#endif // MATERIALS